2001 Buick LeSabre Owner's Manual - Page 166

VENT: The VENT button allows outside air to flow through your vehicle without the air conditioning compressor working. Selecting VENT and the AUTO button at the same time allows the system to control automatically without the use of the RECIRC mode. To turn off the VENT selection, push the VENT button again. If you select VENT while in FRONT defrost, the VENT light will flash three times to let you know this is not allowed. This is to prevent fogging. RECIRC: When RECIRC is selected, the system will limit the amount of outside air entering your vehicle. This is helpful when you are trying to cool the interior of the vehicle quickly or limit the amount of outside air entering your vehicle. RECIRC and AUTO may be selected at the same time. The system will remain in RECIRC until the ignition is turned off, then the system will return back to the previously selected mode. Deselecting the RECIRC button will also turn off the RECIRC function. RECIRC can be selected in all manual airflow modes except FRONT defrost and VENT. If you select RECIRC while in FRONT defrost, the RECIRC light will flash three times to let you know this is not allowed. This is to prevent fogging. FRONT: This selection is used to defrost the windshield by directing the airflow toward the windshield. If FRONT is selected while in the AUTO mode, the fan speed and the air temperature from the front defroster will vary. If a manual fan speed setting is selected, the fan speed will remain at that selection until another fan speed selection is made or the AUTO mode is selected. To turn off FRONT, press the AUTO or AIR FLOW button. FRONT defrost will work better if any ice or snow is cleared from the hood and the air inlet area between the base of the windshield and the hood. 3-7